Stockholders' Equity - Changes (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity
Beginning balance		$ 509.4	$ 508.0	$ 541.1	$ 481.4
Net (loss) income		(1.2)	2.6	0.0	24.2
Share-based compensation		2.3	3.9	$ 2.8	5.6
Exercise of stock options (in shares)				40,000
Exercise of stock options		0.3	1.7	$ 0.7	5.0
Share repurchases	[1]			(0.3)	(3.2)
Current period other comprehensive loss		4.8	(3.9)	(28.7)	(0.7)
Dividends and other changes in noncontrolling interest		(0.4)
Ending balance		$ 515.2	$ 512.3	$ 515.2	$ 512.3
Share repurchases (in shares)				(17,300)	(125,700)
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)		73,300,000	72,900,000	73,200,000	72,400,000
Beginning balance		$ 0.7	$ 0.7	$ 0.7	$ 0.7
Issuance of common stock in connection with stock plans (in shares)	[2]			100,000	300,000
Exercise of stock options (in shares)			100,000	0	300,000
Ending balance (in shares)		73,300,000	73,000,000.0	73,300,000	73,000,000.0
Ending balance		$ 0.7	$ 0.7	$ 0.7	$ 0.7
Treasury Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)		400,000	300,000	300,000	200,000
Beginning balance		$ (8.9)	$ (8.0)	$ (8.6)	$ (4.8)
Share repurchases	[1]			$ (0.3)	$ (3.2)
Ending balance (in shares)		400,000	300,000	400,000	300,000
Ending balance		$ (8.9)	$ (8.0)	$ (8.9)	$ (8.0)
Share repurchases (in shares)	[1]			(100,000)	(100,000)
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity
Beginning balance		54.3	44.6	$ 53.4	$ 39.6
Share-based compensation		2.3	3.9	2.8	5.6
Exercise of stock options		0.3	1.7	0.7	5.0
Ending balance		56.9	50.2	56.9	50.2
Accumulated Earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance		611.3	585.3	610.2	563.9
Net (loss) income		(1.3)	2.6	(0.2)	24.0
Ending balance		610.0	587.9	610.0	587.9
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity
Beginning balance		(150.5)	(116.8)	(117.0)	(120.0)
Current period other comprehensive loss		4.8	(3.9)	(28.7)	(0.7)
Ending balance		(145.7)	(120.7)	(145.7)	(120.7)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity
Beginning balance		2.5	2.2	2.4	2.0
Net (loss) income		0.1	0.0	0.2	0.2
Dividends and other changes in noncontrolling interest		(0.4)
Ending balance		$ 2.2	$ 2.2	$ 2.2	$ 2.2

[1] Refer to Note 15, “Stock Incentive Plans”, for further information.

[2] The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.